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Cardanol blocked isocyanate adhesion promotor for PVC plastisol

Active Publication Date: 2021-02-11
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The PVC plastisol composition described in this patent is a strong adhesion promoter for various metals that can be applied to metals or metal undercoats through a brief thermal treatment at high temperatures. It is stable during storage and has good rheological properties with improved yield value dosing and viscosity stability during applications. Compared to other adhesion promoters, this composition is more effective and efficient in promoting strong adhesion to various metals.

Problems solved by technology

These phenols possess poor environmental and health profiles and their use in industry is currently being restricted.

Method used

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  • Cardanol blocked isocyanate adhesion promotor for PVC plastisol
  • Cardanol blocked isocyanate adhesion promotor for PVC plastisol
  • Cardanol blocked isocyanate adhesion promotor for PVC plastisol

Examples

Experimental program
Comparison scheme
Effect test

example 1

on of Cardanol Blocked Isocyanate Compositions

[0067]Diisodecylphthalate (294.16 g) and cardanol (80.16 g, 0.27 mole) were charged to a dry reactor. The mixture was dried under vacuum (10 mm Hg) and nitrogen sparge to achieve <0.03 wt. % water. It was then heated to 77-82° C. The polyisocyanate (Coronate 2030*), (117 g, 50% in butyl acetate) and Dabco T-12 (0.15 g) were then added. The butyl acetate was distilled at <132-135° C. The temperature of the mixture was reduced to 55° C. and EPON 828 (77.12 g, 0.20 mole) added at <55-60° C. The product was cooled to room temperature.

example 2

on of Cardanol Blocked Isocyanate Compositions with 10% Less Isocyanate

[0068]Diisodecylphthalate (294.16 g) and cardanol (80.16 g, 0.27 mole) were charged to a dry reactor. The mixture was dried under vacuum (10 mm Hg) and nitrogen sparge to achieve <0.03 wt. % water. It was then heated to 77-82° C. The polyisocyanate (Coronate 2030*), (105 g, 50% in butyl acetate) and Dabco T-12 (0.15 g) were then added. The butyl acetate was distilled at <132-135° C. The mixture was cooled to 55° C. and EPON 828 (77.12 g, 0.20 mole) added at <55-60° C. The product was cooled to room temperature.

example 3

on of Cardanol Blocked Isocyanate Compositions with 10% More Isocyanate

[0069]Diisodecylphthalate (294.16 g) and cardanol (80.16 g, 0.27 mole) were charged to a dry reactor. The mixture was dried under vacuum (10 mm Hg) and nitrogen sparge to achieve <0.03 wt. % water. It was then heated to 77-82° C. The polyisocyanate (Coronate 2030*), (129 g, 50% in butyl acetate) and Dabco T-12 (0.15 g) were then added. The butyl acetate was distilled at <132-135° C. The mixture was cooled to 55° C. and EPON 828 (77.12 g, 0.20 mole) added at <55-60° C. The product was cooled to room temperature. *Coronate 2030 is a product of Tosoh Corporation.

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Abstract

The present invention relates to a PVC plastisol composition comprising at least one vinyl chloride polymer selected from polyvinylchlorides and copolymers of vinyl chloride with one or more monomers; at least one plasticizer; at least one epoxy resin; and at least one isocyanate resin blocked with cardanol. The PVC plastisol composition of this invention provides strong adhesion to the surface of various metals or various undercoats of metals by thermal treatment for a short time at 100° C-200° C. and is excellent in storage stability. In addition, it offers good rheological properties with improved yield value dosing and viscosity stability during applications compared to the nonylphenol blocked isocyanate PVC adhesion promotor.

Description

BACKGROUND OF THE INVENTION[0001]Plastisols are dispersions of organic plastics in plasticizers which gel on heating and cure on cooling. PVC plastisols consist of powdered homo or co-polymers of vinyl chloride which are dispersed in a liquid plasticizer to form a paste and used as such in a variety of applications. These include sealing compositions for seams on metals (underseals of motor vehicles) for corrosion protection as well as flange seam adhesives on metal containers. It is also used for coating textile materials such as the backing of carpets and as cable insulators. PVC plastisols are also used for construction of automobile shells, lining reinforcing structures such as engine hoods, door and roof construction and for gluing flange seals and sealing seams in motor vehicles. The advantage of PVC plastisols for these applications is related to to their favorable flow properties at room temperature.[0002]Additives are added to the plastisols to facilitate their intended use...

Claims

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Application Information

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IPC IPC(8): C08L27/06
CPCC08L27/06C08L2205/03C08L2205/025C08G18/8067C08G18/2815C08G18/794C08K5/0016C08K5/29C08L63/00C08L75/00C08K5/10C08G59/4028C08G59/245
Inventor LAL, GAURI SANKARPATEL, PRITESH G.BOYCE, STEPHEN MICHAEL
Owner EVONIK OPERATIONS GMBH